MIL‐125(Ti)‐Based Heterojunctions: Progress in Photocatalytic Applications

ABSTRACT As a frequently used Ti‐based metal‒organic framework (MOF), MIL‐125(Ti) is advantageous for photocatalysis applications because of its extensive surface area, redox properties, and good stability. However, its photocatalytic efficiency is constrained by inadequate visible‐light absorption and fast recombination of photogenerated charges. To address these challenges, the construction of heterojunctions has been proven effective at enhancing charge separation and photocatalytic activity. However, the detailed charge separation mechanisms remain insufficiently understood and systematically summarized. In overcoming the limitations of discussing only Type‐II heterojunctions, this review discusses the thermodynamic advantages and charge migration pathways of Z‐type and S‐type heterojunctions and reveals their intrinsic mechanism for efficient charge separation while retaining strong redox capabilities. Furthermore, this study innovatively summarizes several dual heterojunctions based on MIL‐125(Ti). For the first time, we systematically clarify the interfaces construction strategies (chemical bonding, physical interactions, etc.) and summarize the synthesis methods for fabricating heterojunctions between MIL‐125(Ti) and different materials. Furthermore, the key characterization techniques for verifying heterojunction formation and charge migration pathways are discussed in depth. Finally, it is concluded that MIL‐125(Ti)‐based heterojunctions show significant performance enhancement within the realm of photocatalytic pollutant degradation, CO 2 reduction, and H 2 evolution, and promising future research directions in this field are envisioned.